Even though Katy has extended the olive branch in her tweets, Taylor wants no part of it.A source says:“Why would Taylor want to collaborate with someone whose latest single, “Rise,” didn’t even break the Top 10? Taylor is a ten time Grammy winner. Katy has zero Grammys.”

Apparently Taylor thinks Katy is now a flop and cantsitwithus not because she's still pressed over their "feud", but because Taylor does not want to be seen with a has-been.